Niro Posted December 6, 2021 Report Share Posted December 6, 2021 Hello, I'm trying for the first time to change the gearbox oil in my 1970 Cota 247. I opened the fill plug and remove the drain plug, but only a few drops of oil came out. I tilted the bike but no oil came out. Am I missing something? is there a breather for the gearbox oil? engine number 21M2067 Thanks. Quote Link to comment Share on other sites More sharing options...
kurtas Posted December 6, 2021 Report Share Posted December 6, 2021 Sounds like you're missing gearbox oil 1 Quote Link to comment Share on other sites More sharing options...
Niro Posted December 6, 2021 Author Report Share Posted December 6, 2021 It cross my mind. But is it possible for the gear to work without oil? I took the bike for 2 rides and I was able to change the gears with no issue. One thing I notice- I couldn't put the gear back in Neutral while the bike is idle and stoped. Quote Link to comment Share on other sites More sharing options...
kurtas Posted December 6, 2021 Report Share Posted December 6, 2021 Nothing tells the gears they aren't lubricated with oil Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted December 6, 2021 Report Share Posted December 6, 2021 It's quite possible that the oil has leaked out over time through the casing joints, while the gearbox would continue to function. In fact this isn't really unusual in old bikes which haven't been maintained much. I'd just fill with the correct amount (300ml) and check how much drains out after two or three rides. Quote Link to comment Share on other sites More sharing options...
Niro Posted December 6, 2021 Author Report Share Posted December 6, 2021 Ok folks, thanks! I will fill the gearbox and check as suggested. Cheers. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted December 7, 2021 Report Share Posted December 7, 2021 Sometimes oil doesn't drain out because there is thick sludge in the bottom of the gearbox. Try poking something through the drain hole to see if that is why no oil came out. Another thing to consider is that your bike has two gearbox compartments that are separate. You should also change the oil in the second compartment. Quote Link to comment Share on other sites More sharing options...
Niro Posted December 7, 2021 Author Report Share Posted December 7, 2021 Can you please point me to the second gearbox compartment? I looked again in the manual and couldn't spot any, Unless you meant the clutch box oil. I will try the poking method to see if something is clogged inside. Thanks. Quote Link to comment Share on other sites More sharing options...
bigshineybike Posted December 7, 2021 Report Share Posted December 7, 2021 Yes the clutch oil Quote Link to comment Share on other sites More sharing options...
larry s. k. Posted December 7, 2021 Report Share Posted December 7, 2021 Hi just a thought , possible. oil was drained out for winter storage , , or. ,, does it leek oil , or blow oil out vent near rear sprocket , , my m73 has vent near rear sprocket A breather vent for crankcase , and was blowing oil when the rings , crank seals went out , it was stored many years , in cold , and froze , but the cylinder was pickled , , it’s apart for future rebuild , cheers Quote Link to comment Share on other sites More sharing options...
Niro Posted December 7, 2021 Author Report Share Posted December 7, 2021 Clutch oil just replaced. I don't have the bike that long so I can't tell if there is a leak oil. I will refill and check. Quote Link to comment Share on other sites More sharing options...
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